From the IRRS
Powerplant and drive train was chosen from MTU of Germany, a subsidiary of Mercedes Benz. MTU is a very well regarded rail engine supplier. The engine fully meets the demanding EU emissions directive Class 3a and is the most advanced currently available in terms of emissions. The MTU under-floor “raft” combines the engine (rated at 360kW), Voith hydrodynamic transmission, 3-phase auxiliary power generation, cooling systems, fire protection, hydraulic systems and exhaust silencer all located in a suspended ”H” frame which allows for easy removal. An identical raft is fitted under every vehicle and operates independently. There is a certain amount of power sharing between vehicles in degraded operation and it is an area being looked at currently for further improvement.
Each raft drives a pair of adjacent wheelsets on each vehicle thus every vehicle is mechanically identical in terms of drive train with 1 x raft, 1 x powered bogie and 1 x trailer bogie. The raft also features a dynamic retarder brake through the Voith gearbox which is very efficient and reduces brake wear considerably.